| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * (C) Copyright 2018 Rockchip Electronics Co., Ltd |
| */ |
| |
| #include <common.h> |
| #include <adc.h> |
| #include <asm/global_data.h> |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| #define KEY_DOWN_MIN_VAL 0 |
| #define KEY_DOWN_MAX_VAL 30 |
| |
| /* |
| * Two board variants whith adc channel 3 is for board id |
| * v10: 1024, v11: 512 |
| * v10: adc channel 0 for dnl key |
| * v11: adc channel 1 for dnl key |
| */ |
| int rockchip_dnl_key_pressed(void) |
| { |
| unsigned int key_val, id_val; |
| int key_ch; |
| |
| if (adc_channel_single_shot("saradc", 3, &id_val)) { |
| printf("%s read board id failed\n", __func__); |
| return false; |
| } |
| |
| if (abs(id_val - 1024) <= 30) |
| key_ch = 0; |
| else |
| key_ch = 1; |
| |
| if (adc_channel_single_shot("saradc", key_ch, &key_val)) { |
| printf("%s read adc key val failed\n", __func__); |
| return false; |
| } |
| |
| if (key_val >= KEY_DOWN_MIN_VAL && key_val <= KEY_DOWN_MAX_VAL) |
| return true; |
| else |
| return false; |
| } |